This standard provides the specification for the interfaces which coincide with the Reference Points "A", "A_ter", "A_quater", and "A_quinter" defined in the 3GPP2 Wireless Network Reference Model shown in [I-1] and Reference Points 27 and 48 for Legacy MS Domain Step 1 [18] and Reference Points A1, A1p, A2 and A2p for Legacy MS Domain Step 2 [19].

The scope of this standard includes the following topics:

• MSC-BS and BS-BS interfaces:

− descriptions of the specified functional capabilities that provide wireless telecommunications services across the MSC-BS and BS-BS interfaces as defined in the 3GPP2 Wireless Network Reference Model;

− descriptions of the specified functional capabilities that provide wireless tele36 communications services across the MSCe-BS and the MGW-BS interfaces;

− descriptions of the division of responsibility of the functions provided between the BS and the MSC, and between the source BS and the target BS, without prescribing specific implementations;

− descriptions of the MSC-BS interface and the BS-BS interface standards that support DS-41 and cdma2000 systems.

• BS-PCF interfaces:

− descriptions of the specified functional capabilities that provide packet data services across the BS-PCF interface;

− descriptions of the division of responsibility of the functions provided betwee1 n the BS and the PCF without prescribing specific implementations.

• PCF-PDSN interfaces:

− descriptions of the specified functional capabilities that provide packet data services across the PCF-PDSN interface;

− descriptions of the division of responsibility of the functions provided between the PCF and the PDSN without prescribing specific implementations.

The interfaces defined in this standard are specified by a set of characteristics, including:

• physical and electromagnetic parameters;

• channel structures;

• message types and contents;

• network operating procedures;

• user data framing and transport.